Petrology of the Halifax County complex, North Carolina, Southern Appalachians: constraints from petrography, mineral chemistry, and geothermobarometry
Bibliographic record
Abstract
The Halifax County complex (HCC) is a meta-ultramafic/metamafic body that crops out along the easternmost exposed part of the Carolina superterrane in northeastern North Carolina. Petrographic and mineral chemistry studies were undertaken to place some constraints on the evolution of the HCC. Halifax County Complex amphiboles are zoned, with hornblende cores and actinolitic rims. Feldspar minerals span the whole plagioclase- and potassium-feldspar spectrum. Evolved olivines (Fo69–75) are primary, and pyroxenes plot in the enstatite, pigeonite, augite, and diopside fields. Low TiO2 (<0.8 wt.%) clinopyroxenes and highly calcic plagioclases are consistent with origin of the HCC at an island arc setting. Chlorites are characterized by wide variations in their Si atoms per formula unit but have restricted total Fe concentrations. Potassium feldspar in the HCC likely originated during adularization or potassification. Chlorite thermometry yields temperatures of formation of 241–300 °C. Application of hornblende-plagioclase thermometers yields average temperatures of 648 °C consistent with amphibolite facies conditions as well as greenschist facies conditions, at pressures of up to 6.5 kbar. Both clinopyroxene and evolved olivine compositions are consistent with an island arc origin for the HCC. Amphibolite facies metamorphisms recorded by HCC rocks likely represent metamorphism of the HCC during arc–arc terrane collision, whereas greenschist metamorphism is interpreted to record the temperatures of thrusting of the HCC onto its present location at pressures of <3 kbar in Alleghanian times during the final assembly of the Appalachians. Results reported here have implications for the origin of comparable metamorphosed mafic-ultramafic rocks encountered along ancient orogenic belts worldwide.
Fetched live from OpenAlex and de-inverted. Abstracts are not stored in this database: the inverted indexes are 8.6 GB of the frame’s 9.3 GB of text, and the host has 13 GB free.
How this classification was reachedexpand
Full frame machine prediction
Teacher imitationNot calibrated prevalence, not ground truth. Human validation pending. The Gemma side is a direct model label for every work in the frame, read from the title-only record. The Codex side is a classifier learned from the 10,348 direct Codex labels and calibrated to design-weighted sample rates; fields without enough sample support carry no Codex call. Candidate is the union of the two sides; consensus is their intersection. These outputs are machine_predicted_unvalidated and are not human labels.
Distilled classifier scores by category (both heads)
| Category | Codex | Gemma |
|---|---|---|
| Metaresearch | 0.000 | 0.000 |
| Meta-epidemiology (narrow) | 0.000 | 0.000 |
| Meta-epidemiology (broad) | 0.000 | 0.000 |
| Bibliometrics | 0.003 | 0.002 |
| Science and technology studies | 0.002 | 0.001 |
| Scholarly communication | 0.001 | 0.000 |
| Open science | 0.001 | 0.001 |
| Research integrity | 0.000 | 0.000 |
| Insufficient payload (model declined to judge) | 0.002 | 0.000 |
Machine scores (provisional)
The two teacher heads of the student model, read on this work. A score orders the frame for review; it never asserts a category, and the validation status ships verbatim with every row.
Baseline scores from an immature model (maturity gate not passed, 7 training rounds). Scores rank; they never assert a category.
score_only:v0-immature-baseline · verbatim from the scoring run: score_only means the number may rank works, and no category label ships from itClassification
machine, unvalidatedMachine predicted; a candidate call from one source (direct Gemma or distilled Codex), not a consensus.
How this classification was reached, model by model and score by score, is at the end of the page under "How this classification was reached".